1. An atoll is a ring of coral built up on the top of the crater of a submerged volcano to form a lagoon. How many islands are there inside the lagoon at Midway?

2. How large are Sand and Eastern Islands?

3. The islands are nearly flat and have very little natural vegetation. In spite of being surrounded by water, there is no fresh water. How much work do you think would be needed to construct and maintain a military base here?

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